After reading the new Wyndham policy on 15 day in the future checkin - it states ANY OVERLAPPING RESERVATIONS WITHIN THE TRAVEL PERIOD.
I took that to mean: not just checkin dates overlapping, but also any later checkins at any other resort during that entire reservation without a Guest Certificate or the another member on the member ID listed as checking.
For example, you have a Sat-to-Sat reservation, but leave to checkin at Wyndham resort "B" where you have a Fri-Fri week. You have overlapping reservations and one of your dates WILL be cancelled.
As a single person, I feel this is totally wrong. Two owners will just put one owner on one reservation and the other, on the second reservation. I have no partner; and I regularly book a night or two while visiting a resort for a week (like Bike Week for a Tues&Wed stay while staying in Orlando).